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80719971 = 371378967
BaseRepresentation
bin1001100111110…
…11000001100011
312121212222222120
410303323001203
5131131014341
612002035323
72000052123
oct463730143
9177788876
1080719971
1141623122
1223048b43
1313952cc7
14aa12c83
157147066
hex4cfb063

80719971 has 8 divisors (see below), whose sum is σ = 109142784. Its totient is φ = 53055240.

The previous prime is 80719943. The next prime is 80719997. The reversal of 80719971 is 17991708.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80719971 - 218 = 80457827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80719271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189271 + ... + 189696.

It is an arithmetic number, because the mean of its divisors is an integer number (13642848).

Almost surely, 280719971 is an apocalyptic number.

80719971 is a deficient number, since it is larger than the sum of its proper divisors (28422813).

80719971 is a wasteful number, since it uses less digits than its factorization.

80719971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379041.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 80719971 is about 8984.4293641833. The cubic root of 80719971 is about 432.1756883568.

The spelling of 80719971 in words is "eighty million, seven hundred nineteen thousand, nine hundred seventy-one".

Divisors: 1 3 71 213 378967 1136901 26906657 80719971